I using phone GXP1628 with firmware version 1.0.2.27 (the last at the time). My phone is connected to Asterisk 13 server and be located in the same LAN without any routers and access points. Only switch. The phone has default settings. After reboot it make registration correctly but in several hours I can see on the Asterisk server that the registration was lost:CLI> sip show peers660/660 (Unspecified) D Auto (No) No 0 UNKNOWN

Although "Register Expiration" is set to 60 minutes, registration can drop in 10 minutes or in one hour (randomly). But the phone always indicates that it is registered: "Status -> SIP Registration = YES". I have softphone and it never lost registration on Asterisk.I found events in my full log, but I can't determine does phone or asterisk breaks registration. And also I can't understand this line: "Subscription-State: terminated;reason=timeout". How can subscription timed out in 10 minutes when all timeouts is set to 60 minutes!How can I tell asterisk to show current registration time left?The text of my log below.